Image inspection device and lighting device

Abstract

An image inspection device and a lighting device capable of setting an irradiation solid angle for each location of a visual field and capable of miniaturization are provided. The image inspection device includes a photographing portion that photographs the target, and a light transmissible lighting portion that is disposed between the target and the photographing portion and configured to irradiate light in a direction toward the target. The lighting portion includes a plurality of light-emitting portions that is arranged in a matrix form and configured to be capable of selectively emitting light, and an optical system configured to control irradiation directions of the light emitted from each of the plurality of light-emitting portions to be directions corresponding to positions of each of the plurality of light-emitting portions.

What is claimed is: 
     
       1. An image inspection device which uses photographic images to inspect a target, comprising:
 a photographing portion that photographs the target; and 
 a light transmissible lighting portion that is disposed between the target and the photographing portion and configured to irradiate light in a direction toward the target, wherein an optical axis of the photographing portion directly passes through a light emission surface of the lighting portion; 
 the lighting portion comprising: 
 a plurality of light-emitting portions that is arranged in a matrix form and configured to be capable of selectively emitting light; and 
 an optical system configured to control irradiation directions of the light emitted from each of the plurality of light-emitting portions to be directions corresponding to positions of each of the plurality of light-emitting portions, 
 wherein the optical system is a micro lens array comprising a plurality of concave lenses arranged facing the plurality of light-emitting portions respectively, and each of the plurality of concave lenses is disposed to be respectively corresponding to one of the plurality of light-emitting portions, 
 wherein angles of optical axes of each of the plurality of concave lenses to optical axes of respective one of the plurality of light-emitting portions are different from each other, 
 wherein the optical axes of at least a portion of the concave lenses among the plurality of the concave lenses disposed away from a center of the lighting portion are inclined toward an optical axis of a concave lens disposed corresponding to the center of the light portion, and the optical axis of the concave lens disposed corresponding to the center of the light portion is aligned with an optical axis of a light-emitting portion disposed at the center of the light portion. 
 
     
     
       2. The image inspection device according to  claim 1 , wherein
 the plurality of concave lenses are disposed in a manner that optical axes of at least a portion of the concave lenses among the plurality of concave lenses deviate from optical axes of the light-emitting portions facing at least the portion of the concave lenses. 
 
     
     
       3. The image inspection device according to  claim 2 , wherein
 the lighting portion is divided into a plurality of lighting elements, and 
 in at least one lighting element among the plurality of lighting elements, at least the portion of the concave lenses is disposed with pitches smaller than pitches of the light-emitting portions. 
 
     
     
       4. The image inspection device according to  claim 3 , wherein
 at least the portion of the concave lenses is disposed disturbing regularity. 
 
     
     
       5. The image inspection device according to  claim 1 , wherein the plurality of concave lenses are disposed in a manner that optical axes of at least a portion of concave lenses among the plurality of concave lenses are inclined with respect to optical axes of the light-emitting portions facing at least the portion of concave lenses. 
     
     
       6. The image inspection device according to  claim 1 , wherein
 the lighting portion further includes a light-shielding portion configured to shield the light that is among the light emitted from the plurality of light-emitting portions and leaks from the surrounding of each of the plurality of concave lenses. 
 
     
     
       7. The image inspection device according to  claim 1 , wherein
 the lighting portion further includes 
 a light-shielding portion that is disposed between at least a portion of concave lenses among the plurality of concave lenses and the light-emitting portions facing at least the portion of concave lenses, and 
 the light-shielding portion has pinholes that are formed on locations which are deviated with respect to the optical axes of at least the portion of concave lenses. 
 
     
     
       8. The image inspection device according to  claim 7 , wherein
 the lighting portion further includes a light diffusion portion that diffuses the lights from the plurality of light-emitting portions. 
 
     
     
       9. A lighting device comprising the lighting portion according to  claim 1 . 
     
     
       10. The image inspection device according to  claim 2 , wherein
 the lighting portion further includes a light-shielding portion configured to shield the light that is among the light emitted from the plurality of light-emitting portions and leaks from the surrounding of each of the plurality of concave lenses. 
 
     
     
       11. The image inspection device according to  claim 3 , wherein
 the lighting portion further includes a light-shielding portion configured to shield the light that is among the light emitted from the plurality of light-emitting portions and leaks from the surrounding of each of the plurality of concave lenses. 
 
     
     
       12. The image inspection device according to  claim 4 , wherein
 the lighting portion further includes a light-shielding portion configured to shield the light that is among the light emitted from the plurality of light-emitting portions and leaks from the surrounding of each of the plurality of concave lenses. 
 
     
     
       13. The image inspection device according to  claim 5 , wherein
 the lighting portion further includes a light-shielding portion configured to shield the light that is among the light emitted from the plurality of light-emitting portions and leaks from the surrounding of each of the plurality of concave lenses. 
 
     
     
       14. A lighting device comprising the lighting portion according to  claim 2 . 
     
     
       15. A lighting device comprising the lighting portion according to  claim 3 . 
     
     
       16. A lighting device comprising the lighting portion according to  claim 4 . 
     
     
       17. A lighting device comprising the lighting portion according to  claim 5 . 
     
     
       18. A lighting device comprising the lighting portion according to  claim 6 .